Weak Lensing Discovery and Tomography of a Cluster at z=0.68
arXiv:astro-ph/0210120 · doi:10.1086/378344
Abstract
We report the weak lensing discovery, spectroscopic confirmation, and weak lensing tomography of a massive cluster of galaxies at , demonstrating that shear selection of clusters works at redshifts high enough to be cosmologically interesting. The mass estimate from weak lensing, solar masses within projected radius r, agrees with that derived from the spectroscopy (), and with the position of an arc which is likely to be a strongly lensed background galaxy. The redshift estimate from weak lensing tomography is consistent with the spectroscopy, demonstrating the feasibility of baryon-unbiased mass surveys. This tomographic technique will be able to roughly identify the redshifts of any dark clusters which may appear in shear-selected samples, up to z ~ 1.
Final version. Substantially expanded from first version, including more detail, more figures, and more mass estimates, including an M/L estimate. Basic conclusions unchanged
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